Mao Ningxiong's repositories
Color-image-RDH
This is a reversible data hiding scheme for color images based on capacity allocation
datahiding
Reversible Data Hiding (RDH) techniques have gained popularity over the last two decades, where data is embedded in an image in such a way that the original image can be restored. Early work on RDH was based on the image histogram modification that uses the peak point to embed data in the image. More recent work focuses on the difference image histogram modification that exploits the fact that the neighbouring pixels of an image are highly correlated and therefore a difference of image can be used to embed high amount of data. In this paper we propose a framework to increase the embedding capacity of reversible data hiding techniques that use a difference of image to embed data. The main idea is that instead of taking the difference or the neighboring pixels, we rearrange the columns (or rows) of the image in a way that enhances the smooth regions of an image. Any difference based technique to embed data can then be used in the transformed image. The proposed method is applied on different types of images including textures, patterns and publicly available images. The results demonstrate that the proposed method not only increases the message embedding capacity of a given image by more than 50% but also the visual quality of the marked image containing the message is more than the visual quality obtained by existing state-of-the-art reversible data hiding technique.